test=release/1.8

* CHERR-PICK1.8,add base class of LearningRateEpochDecay, and API: MultiStepDecay, and API: StepDecay,test=release/1.8

* fix unittest to add coverage,test=develop

* test=release/1.8, add index sample

* fix bug of prelu when rank not equal 4, test=develop

* fix prelu inference, test=develop

* fix api, test=develop

* fix shape when mode is chennel, test=develop

* remove debug code, test=develop

* add unittest, test=develop

Fix the bug for elementwise_div op, when the first var is scalar; Use the shape 1 replace the -1 in shape

API/OP（sequence_first_step，sequence_last_step，sequence_mask，beam_search，beam_search_decode） error message enhancement ,test=release/1.8 (#24668)

* API(dynamic_gru, chunk_eval, BeamSearchDecoder) error message enhancement (#24513)

* dynamic_gru err_msg enhancement, test=develop

* chunk_eval err_msg enhancement and fix crf_decoding output type, test=develop

* BeamSearchDecoder err msg enhancement, test=develop

* API/OP(sequence_expand_as) error message enhancement (#23712) 
Co-authored-by: NGuo Sheng <whucsgs@163.com>

* improve error reporting messages

* fix error check of stack and space_to_depth
* test=develop

Enhance error message of cross_entropy_op, sigmoid_cross_entropy_with_logits_op, test=release/1.8 (#24542)

* Format error message for ops, test=release/1.8

* Fix check in sequence_expand, test=release/1.8

* fix error message, test=develop

* update err msg for dynamic_lstm and dynamic_lstmp, test=develop

test=develop

* API/OP (Some SL API) error message enhancement  (#24441)

* polish some sl api error message, test=develop

* polish python input check of stride slice, test=develop

* fix unittest bugs, test=develop

* fix error info for transpose sequence_conv_pool max_sequence_len sequ… (#24437)

* fix error info for transpose sequence_conv_pool max_sequence_len sequence_erase, test=develop

* fix error info for transpose sequence_conv_pool max_sequence_len sequence_erase, test=develop

* update modify, test=develop

* update modify, test=develop

* fixed some modifications, test=develop
Co-authored-by: NXing Wu <wuxing03@baidu.com>

* enhance rank_loss error message, test=develop

* enhance similarity_focus error message, test=develop

* enhance squeeze error message, test=develop

* fix error log: resahpe, range, reverse.

* test=develop

* test=develop

* Fix error info (#23891)

* fix error info for rnn related api

* passed local test, test=develop

* double check the code

* double check the code, test=develop

* update 'shape' check in RNNCell, test=develop

* add long dtype to RNNCell

* fix long type in python3
Co-authored-by: NXingWu01 <wuxing@iie.ac.cn>

* fix rnn check_type list error (#24346)

* fix rnn check_type list error

* tigger ci, test=release/1.8

* update modify, test=release/1.8
Co-authored-by: NXingWu01 <wuxing@iie.ac.cn>

* API/OP (margin_rank_loss, nce, row_conv, glu, positive_negative_pair) error message enchancement, test=release/1.8

OP(warpctc, add_position_encoding, scaled_dot_product_attention) error message enhancement (#24261) (#24372)

* enhance add_position_encoding error message, test=develop

* enhance warpctc & scaled_dot_product_attention error message, test=develop

* modified error message and ctest of scaled_dot_product_attention, test=develop

* test=develop fix generate_proposals

* update paddle/tensor, test=develop

* update linalg,py, test=develop

* update nn/functional, test=develop

* delete paddle/tensor/*, test=develop

* merge upstream, test=develop

* update __init__, test=develop

* pass ci, test=develop

* merge latest. test=develop

* move full_like to fluid.layers

* copy api from paddle to paddle.fluid, test=develop

* fix optest, test=develop

* cherrypick: add kron op (#24105)
* add kron op and fluid.layers.kron
* add paddle.complex.kron